Download MendeleyMechanism and Structure-Guided Optimization of SLC1A1/EAAT3-Selective Inhibitors in Kidney Cancer.
Koochaki, P., Qiu, B., Coker, J.A., Earsley, A., Wang, N.S., Romigh, T., Goins, C.M., Stauffer, S.R., Boudker, O., Chakraborty, A.A.(2025) bioRxiv
- PubMed: 40672197
- DOI: https://doi.org/10.1101/2025.07.03.663021
- Primary Citation of Related Structures:
9P4X, 9P4Y, 9P4Z - PubMed Abstract:
Renal Cell Carcinomas (RCCs) depend metabolically on the trimeric sodium-coupled aspartate and glutamate transporter, SLC1A1/EAAT3; however, pharmacologically targeting SLC1A1 is challenging. We determined a cryo-EM structure of human SLC1A1 bound to compound 3e , a recently described SLC1A1-selective bicyclic imidazo[1,2- α ]pyridine-3-amine (BIA) inhibitor. 3e binds a membrane-embedded, allosteric pocket accessible only in the apo state, when SLC1A1 is unbound to substrate and sodium. Wedged between the trimerization domain and the substrate-binding transport domain, together with a cholesterol moiety from the lipid bilayer, 3e likely prevents sodium and substrate binding, and blocks SLC1A1's elevator-like movements that are essential for transport. Mutations in this pocket abolish 3e binding and counteract 3e 's cytotoxicity in RCC cells, confirming on-target activity and explaining SLC1A1 selectivity. A structure-guided medicinal chemistry effort yielded two new, SLC1A1- selective BIA derivatives, PBJ1 and PBJ2, with enhanced cytotoxicity resulting from the inhibition of SLC1A1-dependent aspartate, glutamate, and cysteine metabolic pathways.
